//	Copyright (c) 2009 App Aware
//
//	Permission is hereby granted, free of charge, to any person obtaining a copy of this software
//	and associated documentation files (the "Software"), to deal in the Software without restriction,
//	including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
//	and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so,
//	subject to the following conditions:
//
//	The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
//
//	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
//	INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
//	BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
//	TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

#import "UIImageMask.h"


@implementation UIImage (Mask)
/**
 * NOTE: The mask image cannot have ANY transparency. Instead, transparent areas must be white or some value between black and white.
 * The more towards black a pixel is the less transparent it becomes.
 **/
- (UIImage*)maskWithImage:(UIImage *)maskImage {
	CGImageRef maskRef = maskImage.CGImage; 
	
	CGImageRef mask = CGImageMaskCreate(CGImageGetWidth(maskRef),
										CGImageGetHeight(maskRef),
										CGImageGetBitsPerComponent(maskRef),
										CGImageGetBitsPerPixel(maskRef),
										CGImageGetBytesPerRow(maskRef),
										CGImageGetDataProvider(maskRef), NULL, false);
	
	CGImageRef masked = CGImageCreateWithMask([self CGImage], mask);
	
	CGImageRelease(mask);
	
	return [UIImage imageWithCGImage:masked];
}

@end
